乌石凹陷东区流沙港组二段构造转换带控制下的优质储层分布研究  

Study on the distribution of high-quality hydrocarbon reservoirs under the control of structural conversion zone in the second member of Liushagang formation in the eastern area of Wushi sag

作　　者：满勇 邓勇 胡林 张帅 薛红涛 刘娟 MAN Yong;DENG Yong;HU Lin;ZHANG Shuai;XUE Hongtao;LIU Juan(CNOOC China Limited,Hainan Branch,Haikou 570311,China)

机构地区：[1]中海石油(中国)有限公司海南分公司,海口570311

出　　处：《物探化探计算技术》2023年第2期146-155,共10页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家科技重大专项(2016ZX05024-006);中海油南海西部油田上产2000万方关键技术研究项目(CNOOC-KJ135ZDXM38ZJ)。

摘　　要：构造转换带控制了古地貌和古水流方向,进而控制了沉积体系分布,对油气成藏有着重要控制作用。钻探实践表明,乌石凹陷东区流沙港组二段油气成藏条件优越,是寻找优质储量的有利领域,但流二段油藏单层厚度薄、连通性差、储层非均质性强。因此研究优质储层成因与展布是该区油气勘探的关键。本次研究综合利用测录井、地震、岩心等资料,结合构造转换带控沉积分析,剖析流二段优质储层主控因素及分布规律。研究结果表明:侧接叠覆转换带对物源水系具良好控制作用,是砂体有利卸载富集区,控制厚层砂体展布;沉积微相类型、泥质含量与砂岩粒度是影响流二段储层物性的主控因素;侧接叠覆转换带是优质储层的有利发育区,是寻找优质油藏的重要探区。The tectonic transition zone controls the paleogeographic pattern and paleocurrent direction and then controls the distribution of the sedimentary system.It plays a vital role in controlling oil and gas accumulation.Drilling practice shows that reservoir formation conditions of the second member of Liushagang formation in the eastern area of Wushi sag are superior,which is the most natural area for finding high-quality reserves.However,the single layer of the second member of the Liushagang formation reservoir has a single thin layer,poor connectivity,and firm reservoir heterogeneity.Therefore,studying the genesis and distribution of high-quality reservoirs is the key to oil and gas exploration in this area.In this study,the extensive use of logging,seismic,wall core,and other data,combined with the analysis of structural transition zone controlled deposition,Analysis of the main controlling factors and distribution law of high-quality reservoirs in the second member of the Liushagang formation in this area.The results show that:The lateral-overlay structural conversion zone has an excellent guide to the source water system and controls the development zone of high-quality reservoirs;Types of sedimentary microfacies,mud content,and sandstone particle size are the main factors affecting the physical properties of the second member of Liushagang formation reservoir;The lateral-overlay structural conversion zone is favorable development areas for forming high-quality reservoirs,and also essential exploration areas for finding high-quality oil reservoirs.

关 键 词：乌石凹陷 构造转换带 优质储层 主控因素 重要探区 

分 类 号：P631.4[天文地球—地质矿产勘探]